Composition for preventing set-offs in printing.



GEORGE STEELE DUNCAN AND GEORGE HENRY POTTS, OF EDINBURGH,

SCOTLAND, ASSIGNORS TO AMERlOAN OFFSET 'UOMPANY. OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMPOSITION FOR PREVENTING :SET-OFFS IN PRTNTIING.

To all whom it may concern:

Be it known that we, GEORGE STEELE DUNCAN and GEORGE HENRY Po'rrs, subjects of the King of the United Kingdom oi Great Britain and Ireland, and residents of Edinburgh, Scotland, have invented a certain new and useful Improvement in Compositions for Preventing Set-Offs in Printing, of which the following is a specification.

This invention has for its object the provision of an improved composition to prevent set-oil or transfer of ink from one sheet to another or from one side to the reverse side of a sheet in printing, the said composition being particularly applicable for use in rotary printing-presses, rotary presses for magazineprinting, perfecting-machines, and fiat-bed single-cylinder machines.

This composition in its preferred embodiment consists of a pomade or paste for use upon set-off rollers of printing-presses, par ticularly presses of the character above referred to.

The composition comprises in its preferred embodiment soap, ,referably soft soap, a non-volatile oil, pregzz-rably a non-drying oil, such as olive-oil, and a resinous substance, preferably turpentine. The proportions in which the ingredients are preferably mixed are equal volumes of olive-oil and turpentine and about two ints of soft son. for every one-half pint of o ive-oil employe A useful pomade can be made in which the proportions of the materials vary widely from those stated. In fact, good results are obtained when three times as much olive oil as turpentine is employed; but it is ordinarily edvisable not to exceed this limit. One of the efiects of varyin the report-ions of the ingredients is to. a ter t e consistency of the aste or pomade so that for certain uses it is advisable to vary the roportions widely from those above given, 9. though for general use such proportions are, as stated, ordinarily referred.

able excess of al add some lard.

soaps the quantity of lard which can be advantageously added ma be one-sixth oi the weight of the sea The quantity of lard, however, to be added, depends upon the excess of alkali present in the soap. Should ah, it is'advantageous to Specification of Letters Patent. Application filed November 13, 1995. Serial). 2881MB.

If the soap employed contains a consider.

With some very alkalinev Patented Tilly '10, 190B.

the excess of alkali be very large, the quantity of lard may be increased proportionatel In preparin the pomade the ingredients are well mixe preferably with the application of a gentle heat for a short time. The mixture is then allowed to cool, and the pomade or paste is ready for use. 60

The pomade or paste is preferably applied when t 1e machine is ready to start printing. It is better to apply the aste before starting up the machine than whi c it is running. The composition is applied by means of a clean rag saturated with tur entine, naphtha, or other like solvent, whic 1 is dipped in the pomade or paste and the rollers well rubbed with it. The material may also be applied by hand. The rollers are subsequently cleaned with a dry rag.

If the machine is to print superfine calendered paper or soft-sized paper, it is advisable to use the pomade or paste sparin ly. If the machine is one which registers bagly, the pomade should be used very sparingly.

While the ingredients and pro ortions above given are those which are pre erred, it is to be understood that this invention is not limited thereto, as the proportions ma be varied within Wide limits and certain o the in redients omitted.

he invention is to be considered as broadly embracing the features of novelty in a composition for the pur ose specified as defined within the scope of t e a pended claims.

Having thus describe our invention, what we claim, and desire to secure by Letters Patent of the United States, is-

1. A composition for preventing set-on, comprising a liquid non-volatile oil and soap.

2. A composition for preventing set-oil, comprising a liquid non-volatile oil and soft soa 3 A com osition for preventing set-ofi, comprising 0 ive-oil and soap.

4. A composition for preventing set-ofi, comprising oil, soap and a resinous substance.

5. A composition for preventing set-off, comprising oil, soap, and turpentine.

6. A composition for preventing set-oil, comprising a non-volatile oil, soap, and turpentine. 1

i. A composition for preventing set-oil, comprising a non-volatile oil, soft soap, and 105 turpentine.

8. A composition for preventin set-ofi, and lard, substantially in the proportions comprising olive-oil, soft soap, an turpenspecified. tine. In testimony whereof we have signed our 9. A composition for preventing set-off, names to this specification in the presence of 15 5 comprising a non-volatile oil, soap, a resinous two subscribing Witnesses.

substance, and a fat.

GEORGE STEELE DUNCAN. 10. A composition for preventlng set-oii comprising a non-volatile oil, soap, a resin- GEORGE HENR1 POTTS' ous substance, and lard. Witnesses: 1o 11. A com osition for preventing set-off WALLACE FAIRWEATHER,

comprising 0 ive-oil, soft soap, turpentine, JNo. ARMSTRONG, Junr. 

